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Table 2 Inclusion and exclusion criteria and rationale

From: Can reduce -the effects of chat-counseling and web-based self-help, web-based self-help alone and a waiting list control program on cannabis use in problematic cannabis users: a randomized controlled trial

Inclusion Criteria

Reasoning

- Minimum age of 18 years

To ensure a minimal age of participation

- At least once a week cannabis use over the 30 days prior to study entry

To include occasional users to provide extended study validity

- Current serious psychiatric disease or history of psychosis, schizophrenia, bipolar type I disorder or significant current suicidal or homicidal thoughts

To avoid exacerbation of serious symptoms of these severe psychiatric diseases

- Other pharmacological or psycho-social treatments for cannabis use disorders

To avoid confounding treatment effects

- Inability to read or write in German

To avoid confounding drug effects

- For women: pregnancy and breastfeeding

To prevent subjects with these conditions from entering the study